Sound Under the Loch: teacher key

Bigfoot and the Loch Ness Monster, grade 10 edition, written for 10th grade. Sonar boats, underwater cameras and a water-sampling survey have all searched Loch Ness for a monster. This is what each method could find, and what it could not.

Read the book. Print this page for the key.

Questions and answers

1. What did Operation Deepscan use in 1987?
   • A fleet of sonar boats (answer)
   • A submarine
   • Underwater flippers
2. What did the Deepscan objects probably turn out to be?
   • A plesiosaur
   • Debris or thermal effects, or possibly a seal (answer)
   • Giant eels
3. How long does eDNA in the loch samples show what has been in the environment?
   • The last 24 to 48 hours (answer)
   • The last 65 million years
   • The last 3,000 years
4. Why could the 2018 team not rule out giant eels?
   • Eels were not found
   • Eel DNA does not tell how big the eels are (answer)
   • The sonar failed
5. In the text, what does "persuasive" mean?
   • Able to convince (answer)
   • Very old
   • Hidden

Words

• sonar: sound that finds
• enhancement: digital touching-up
• thermal: about heat
• eDNA: DNA in water
• plesiosaur: old sea reptile